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Do particles pop into and out of existence?
I can not recall why but I formed the impression that the virtual particles only move in and out of our ability to manage them in a math sence...
And perhaps the first matter to address is if the proposition that particles pop into and out of existence to define "the place" virtual particles go when they pop "out".
Where do they go?
Can that place or condition be demonstrated?
Alex

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Was this a notion of Dirac's? I don't think I have ever read that it was.

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The Dirac sea interpretation and the modern QFT interpretation are related by what may be thought of as a very simple Bogoliubov transformation, an identification between the creation and annihilation operators

We know it is either finite or infinite and we also know it allows for spatial fields to be ''resident occupants '' . Additionally it allows wave energy and particles to freely traverse through it without an opposing resistance force. We also know it can be measured in a finite sense of dimensions x,y,z .